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United Nations nuclear monitors say Iran has admitted to misleading them over its experiments with plutonium.
The UN's nuclear watchdog is expected to confirm later that Iran continued experimenting with plutonium - a key component of atomic bombs - until 1998.
Iran had previously told the body it had ended its experiments in 1993.
Correspondents say these latest inconsistencies in Iran's account will fuel suspicions about the real aims of its nuclear programme.